//#include <stdio.h>
#include <stdio.h>
#include <stdio.h>
#include <stdio.h>
#include <stdio.h>
#include <stdio.h>

int main()
{
	printf("hello world\n");printf("hello xiaoc\n");	
	
	printf("hello world\n");printf("hello xiaoc\n");
	printf("hello world\n");printf("hello xiaoc\n");
	printf("hello world\n");printf("hello xiaoc\n");
	printf("hello world\n");printf("hello xiaoc\n");
	printf("hello world\n");printf("hello xiaoc\n");
	printf("hello world\n");printf("hello xiaoc\n");
	printf("hello world\n");printf("hello xiaoc\n");
	printf("hello world\n");printf("hello xiaoc\n");
	printf("hello world\n");printf("hello xiaoc\n");
	printf("hello world\n");printf("hello xiaoc\n");
	printf("hello world\n");printf("hello xiaoc\n");
	printf("hello world\n");printf("hello xiaoc\n");
	printf("hello world\n");printf("hello xiaoc\n");
	printf("hello world\n");printf("hello xiaoc\n");
	printf("hello world\n");printf("hello xiaoc\n");
	printf("hello world\n");printf("hello xiaoc\n");
	printf("hello world\n");printf("hello xiaoc\n");
	printf("hello world\n");printf("hello xiaoc\n");
	printf("hello world\n");printf("hello xiaoc\n");
	printf("hello world\n");printf("hello xiaoc\n");
	printf("hello world\n");printf("hello xiaoc\n");
	printf("hello world\n");printf("hello xiaoc\n");
	printf("hello world\n");printf("hello xiaoc\n");
	printf("hello world\n");printf("hello xiaoc\n");
	printf("hello world\n");printf("hello xiaoc\n");
	
	return 0;
}
